Celmisias tolerant of cold?

I am thinking of ordering some Celmisia seeds to trial in southwestern Nova Scotia. Our winters are fairly wet, monthly average rainfall  for November =112 mm, December = 90 mm, January = 73 mm, February = 52 mm, March = 65 mm. Average snowfall during these months in cm is as follows N =7, D = 34, J = 59,  F = 40,  M = 36 cm. Our monthly average winter high and low temperatures in celcius are: N  7.6 / 1.3,  D 2.0 / -4.8,  J -0.3 / -8.1,  F 0.0 / -8.0, M 3.7 / -4.2

Some of the species under consideration are C. allanii, C. densiflora, C. hectorii, C. lyallii, C. monroi, C. ramulosa, C. semicordata,  or C spectabilis.

If any forumists have advice on which of these might have a fighting chance at success in my part of the world, I'd be in your debt!